What is SPAM? Spam (spām) - unsolicited bulk commercial electronic mail message
CAN-SPAM CAN-SPAM defines a "commercial electronic mail message" as "any electronic mail message the primary purpose of which is the commercial advertisement or promotion of a commercial product or service (including content on an Internet website operated for a commercial purpose)." It exempts "transactional or relationship messages."
Realistically, SPAM is just EMAIL PEOPLE DON’T WANT TO RECEIVE.